It will seep through mortar. To stop this happening using common tools for masonry. The most common masonry supplies like paint and stain are able to whitewash brick. It is possible to whitewash brick using typical masonry materials, by viewing the YouTube video “How to Whitewash Brick Using Masonry”.
Mix together some mortar using an mixer or bucket, then add water until it’s wet enough that it can move easily using your hands. Apply a trowel the mortar on the bricks. Next, make sure each brick row is completely coated with moist mortar.
The next thing is to leave the mortar to cure in the night prior to applying paint and staining. To get paint or stain to stick to wet surfaces such as concrete slabs and bricks you need to apply more pressure than normal. Additionally, you can employ a paintbrush or roller to cover areas with tiny cracks in bricks. This allows some moisture to penetrate the paint to enable it to adhere.